java 非法字符过滤 , 半角/全角替换

package mjorcen.netty.test1;

import java.io.UnsupportedEncodingException;

public class CharByteConverter {

    /**
     * 全角转半角
     *
     * @param str
     * @return
     *
     * @author mjorcen
     * @email [email protected]
     * @dateTime Sep 27, 2014 2:51:50 PM
     * @version 1
     */
    @Deprecated
    public static final String toSingleByte(String str) {
        StringBuffer outStrBuf = new StringBuffer("");

        String Tstr = "";
        byte[] b = null;
        for (int i = 0; i < str.length(); i++) {
            Tstr = str.substring(i, i + 1);
            // 全角空格转换成半角空格
            if (Tstr.equals("　")) {
                outStrBuf.append(" ");
                continue;
            }
            try {
                b = Tstr.getBytes("unicode");
                // 得到 unicode 字节数据
                if (b[2] == -1) {
                    // 表示全角
                    b[3] = (byte) (b[3] + 32);
                    b[2] = 0;
                    outStrBuf.append(new String(b, "unicode"));
                } else {
                    outStrBuf.append(Tstr);
                }
            } catch (UnsupportedEncodingException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        } // end for.
        return outStrBuf.toString();

    }

    /**
     * 半角转全角
     *
     * @param str
     * @return
     *
     * @author mjorcen
     * @email [email protected]
     * @dateTime Sep 27, 2014 2:52:06 PM
     * @version 1
     */
    @Deprecated
    public static final String toDoubleByte(String str) {
        StringBuffer outStrBuf = new StringBuffer("");
        String Tstr = "";
        byte[] b = null;
        for (int i = 0; i < str.length(); i++) {
            Tstr = str.substring(i, i + 1);
            if (Tstr.equals(" ")) {
                // 半角空格
                outStrBuf.append(Tstr);
                continue;
            }
            try {
                b = Tstr.getBytes("unicode");
                if (b[2] == 0) {
                    // 半角
                    b[3] = (byte) (b[3] - 32);
                    b[2] = -1;
                    outStrBuf.append(new String(b, "unicode"));
                } else {
                    outStrBuf.append(Tstr);
                }
                return outStrBuf.toString();
            } catch (UnsupportedEncodingException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
        return outStrBuf.toString();
    }

    /**
     * 半角转全角
     *
     * @param str
     * @return
     *
     * @author mjorcen
     * @email [email protected]
     * @dateTime Sep 27, 2014 2:52:31 PM
     * @version 1
     */
    public static String ToSBC(String str) {
        char c[] = str.toCharArray();
        for (int i = 0; i < c.length; i++) {
            if (c[i] == ‘ ‘) {
                c[i] = ‘\u3000‘;
            } else if (c[i] < ‘\177‘) {
                c[i] = (char) (c[i] + 65248);

            }
        }
        return new String(c);
    }

    /**
     * 全角转半角
     *
     * @param str
     * @return
     *
     * @author mjorcen
     * @email [email protected]
     * @dateTime Sep 27, 2014 2:52:50 PM
     * @version 1
     */
    public static String ToDBC(String str) {
        char c[] = str.toCharArray();
        for (int i = 0; i < c.length; i++) {
            if (c[i] == ‘\u3000‘) {
                c[i] = ‘ ‘;
            } else if (c[i] > ‘\uFF00‘ && c[i] < ‘\uFF5F‘) {
                c[i] = (char) (c[i] - 65248);

            }
        }
        String returnString = new String(c);
        return returnString;
    }

    public static void main(String[] args) {
        long l = System.currentTimeMillis();
        for (int i = 0; i < 100000; i++) {
            String str = "８１４乡道阿斯蒂芬１２３／．１２，４１２看２家１快２看了就２；看了２叫看来＋看来家１２考虑就２３；了３接口２了２会２，．水电费苦辣时间的２　　１２５１２３１２３１２１２０９－０２１～！＠＃＄％＾＆＊（）＿";
            String result = ToDBC(str);
            ToSBC(result);
        }
        System.out.println(System.currentTimeMillis() - l);
    }

}